The Sigma 8-16mm F4.5-5.6 DC HSM is the widest-angle rectilinear lens yet made for APS-C DSLRs. Essentially an equivalent of the company's full-frame 12-24mm F4.5-5.6 II DG HSM, this APS-C only lens features a disorientatingly-wide angle of view of 121-degrees for exaggerated perspectives. It has a built-in petal shaped hood, HSM focusing with full-time manual override, and a minimum focus of 24cm.